Abstract

For the analysis of outdoor monitored PV data it is important to have both good quality and complete inputs including setup data, date and time, plane of array irradiance, module and ambient temperatures, wind speed, string dc voltage and current (if available), inverter ac power – all at least once an hour. However for various reasons some of these values might be missing or incorrect. Summing energy yield each measurement into yearly kWh/kWp figures means that these errors may not be noticed. Consequently, models developed to analyse output data from correct and complete input data will be invalid. This paper describes how to analyse data if some of the inputs are missing and shows how to correct performance.

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